Giải hộ em 2 bài vs ạ

Bài 4:

1, -7264+(1543+7264)

=(-7264+7264)+1543

=0+1543

=1543

2, (144-97)-144

=(144-144)-97

=0-97

=-97

3, (-145)-(18-145)

=(-145+145)-18

=0-18

=-18

4, 111+(-11+27)

=(111-11)+27

=100+27

=127

5, (27+514)-(486-73)

=27+514-486+73

=(27+73)+(514-486)

=100+28

=128

6, =36+79+145-79-36

=(36-36)+(79-79)+145

=145

7, =10-12-10

=(10-10)-12

=-12

8, (38-38)+(43-43)-29

=-29

9, =271+43-271-17

=(271-271)+(43-17)

=26

10, =-144-[29-144-144]

=-144-29+144+144

=(-144+144+144)-29

=144-29

=115

Bài 5:

1, =(-8).(-4)

=32

2, =18:(-6)

=-3

3, =4.(-4)

=-16

4, =72:(-8)

=-9

5, -21+20+1

=0

6, 18-5-7

=6

7, -3.(-3)-8

=9-8

=1

8, =48-2-21

=25